Forging furnace



Jan. 9, 1934. A. .1. NORDENSON FORG ING FURNACE Filed May 11, 1932 2 Sheets-Sheet 1 Inventor: KJTNor-denson a2 ffttornegs Jan. 9, 1934. A. J. NORDENSON FORGING FURNACE Filed May 11, 1952 2 Sheets-Sheet 2 Fig :3

Inventor N or-denson Patented Jan. 9, 1934 UNITED STATES PATENTYTOJFFICE 2 Claims. (01. 263-99) My invention relates to forging furnaces, and while intended more particularly for heating metal to be forged it may also be employed for other purposes, such as welding. Among the objects of the invention are the provision of emcient and convenient means for concentrating the heat supplied by the furnace at the place where a metal bar is to be heated and the provision of means for protecting the operator from the heat of the flame while permitting him to observe the condition of the metal which is being heated.

The full objects and advantages of my invention will appear in connection with the description thereof, and the novel features of my inventive idea will be particularly pointed out in the claims.

In the drawings, which illustrate a practical embodiment of my invention,-

Fig. 1 is a top plan view of the furnace. Fig. 2 is a view in central vertical section. Fig. 3, sheet 2, is a rear end view. Fig. 4 is a view in vertical section on the line 44 of Fig. 5. Fig. 5 is a view in horizontal section on the line 55 of Fig. 4. Fig. 6 is a perspective view of a portion of the top of the furnace.

As shown in the drawings, and referring first more particularly to Fig. 2, it will be seen that I provide a furnace 10 having a vertical passage 12 therein at the bottom of which an extension 14-. is secured to the furnace. The lower end of the extension 14 is provided with a slide 16 carrying a stop 18 which prevents the slide from being entirely withdrawn from the extension. The furnace is also provided with a horizontal passage 20 which extends from the rear of the furnace through the passage 12 and terminates in the furnace adjacent the passage 12 so that the vertical passage intersects the horizontal passage. The inlet of passage 20 is provided with a suitable atomizing oil burner 22, the specific construction of which does not constitute any part of the present invention. A liquid fuel supply pipe 24 leads into the burner 22, while a pipe section 26 leads into a control device 28 which controls the supply of air to the burner. The pipe section 26 leads from a union 30 to which a supply pipe 32 leads from any suitable source of compressed air. A pipe line 34 containing a control valve 36 leads from the union 30 into the extension 14 for supplying compressed air thereto. The pipe line 34 before it reaches the valve 36 is provided with a union 38 from which ahorizontal pipe section 40 extends. The pipe section 40 is connected by an elbow 42 with a vertical pipe section 44, which in turn is connected by an elbow 46 with a horizontal pipe section 48 which leads to an air control device 50. From this latter control device a horizontal pipe section 52 leads to an elbow 54. which connects the section 52 with a horizontal pipe member 56 extending at right angles thereto and whose upper side is provided with a multiplicity of perforations 58 for producing upwardly directed jets of air which form an air screen 60. A number of refractory bricks or slabs 62 is placed on top of the furnace 10 so as to be adapted for piling up any desired arrangement adjacent the upper end of the passage 12 where it emerges from the furnace. These bricks serve not only to support a metal bar B whose inner end portion is to be heated, but also serve to properly control and distribute the heat coming from the passage 12. At the front of the furnace two standards 64 extend upwardly, these standards each being provided with a series of upwardlyinclined notches 66, as shown in Fig. 2. These notches serve to adjustably support a rod 68 from which a pair of screen plates '70 are hung. These plates in connection with the air screen protect the operator from the heat of the flame emerging from the passage 12. The operator can look under the plates 70 and through the air screen 60 in order to observe the condition of the end of the bar B which is being heated.

The operation and advantages of my invention will be understood in connection with the foregoing description. The operator stands at the front of the furnace and places the metal bars whose ends are to be heated in position as shown in Fig. 2, and removes them at the proper time while protected from the heat in the manner previously stated. The atomized fluid fuel coming from the burner 22 passes in through the passage 20 and is met by the blast of air rising from the extension 14. This blast of air carries the heat upwardly so that the hottest part of the flame is concentrated adjacent the end of the bar B at about the position indicated at P. This results in very quickly heating the end of the bar to the desired temperature, which may be readily observed by the operator. It will be noted that the main pipe 32 supplies compressed air to the burner 22, to the extension 14, and to the perforated pipe 56. The provision of the slide 16 affords ready means for removal of scale which drops from the metal being heated. A further advantage of my furnace is that the blast of air prevents localized heating at the inner end of the horizontal passage 20 in contrast to present constructions of furnaces where the heat is driven directly against the end of the horizontal passage before proceeding on its course upwardly. My construction therefore results in preventing burning out of the furnace lining and obtains much longer life of the furnace.

I claim:

1. A forging furnace having a horizontal passage extending from the exterior into the interior thereof, a burner for said passage, a vertical passage intersecting said horizontal passage, means for supporting the article to be heated at the upper end of said vertical passage, an extension at the bottom of said vertical passage, a movable closure for said extension, and a pipe leading into said extension for supplying compressed air to said vertical passage whereby the hottest part of the flame coming from said burner is carried up to a place adjacent said supported article.

2. A forging furnace having a horizontal passage extending from the exterior into the interior thereof, a burner for said passage, a vertical passage intersecting said horizontal passage, means for supporting the article to be heated at the upper end of said vertical passage, a perforated pipe at the front of the furnace for producing an air screen to protect the operator from heat, a supply pipe leading from a source of compressed air to the lower portion of said vertical passage whereby the hottest part of the flame coming from said burner is carried up to a place adjacent said supported article, a branch pipe connecting said supply pipe with said perforated pipe, and a plate screen supported in spaced relation above said perforated pipe whereby an air screened gap is provided through which the operator may observe the article which is being heated.

ARNOLD J. NORDENSON. 

